| 摘要 |
A high ratio speed reducer comprising a rotatable input shaft operatively coupled to an output shaft which rotates at a reduced speed in response to rotation of the input shaft. An output sprocket is mounted on the output shaft for rotation therewith, the output sprocket having a circumferential perimeter including a number of teeth. A drive sprocket having a circumferential perimeter including a number of teeth differing by at least one tooth from the number of output sprocket teeth is rotatably mounted with respect to an eccentric end portion of the input shaft and orbits as the input shaft is rotated. Successive segments of the drive sprocket perimeter continuously move outside the output sprocket perimeter as the drive sprocket orbits to advance an endless double chain engaging both sprockets.
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